The Tippmann SL2-6 Oring is used in several places. It is the SL2-6 Cyclone Feeder Cylinder Reset Rod Oring but it can also be used on some guns as the Safety Pin Oring. A few Cyclone Feeder diagrams have the Reset Rod Oring labeled as the Safety Pin Oring. They ARE the same oring but this label causes confusion so we have corrected that on the diagrams on our site.